code: def tearDown(self):
      self.cluster.stop()
      self.cluster.teardown(keep_dir=True)
  
file_path: ray/python/ray/tune/tests/test_multinode_sync.py
imports: import sys
  import time
  import unittest
  import ray
  from ray import train, tune
  from ray.air.util.node import _force_on_node
  from ray.autoscaler._private.fake_multi_node.test_utils import DockerCluster
  from ray.tune.callback import Callback
  from ray.tune.experiment import Trial
  from ray.util.scheduling_strategies import PlacementGroupSchedulingStrategy
label_desc: Use image node_id 2 for calling the MultiNodeSyncTest obj's underlying member method code with example usage: obj.tearDown() without return types